1 files changed, 84 insertions, 0 deletions
diff --git a/lib/gitlab/git/remote_repository.rb b/lib/gitlab/git/remote_repository.rb
new file mode 100644
index 00000000000..6bd6e58feeb
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+++ b/lib/gitlab/git/remote_repository.rb
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+module Gitlab
+  module Git
+    #
+    # When a Gitaly call involves two repositories instead of one we cannot
+    # assume that both repositories are on the same Gitaly server. In this
+    # case we need to make a distinction between the repository that the
+    # call is being made on (a Repository instance), and the "other"
+    # repository (a RemoteRepository instance). This is the reason why we
+    # have the RemoteRepository class in Gitlab::Git.
+    #
+    # When you make changes, be aware that gitaly-ruby sub-classes this
+    # class.
+    #
+    class RemoteRepository
+      attr_reader :path, :relative_path, :gitaly_repository
+
+      def initialize(repository)
+        @relative_path = repository.relative_path
+        @gitaly_repository = repository.gitaly_repository
+
+        # These instance variables will not be available in gitaly-ruby, where
+        # we have no disk access to this repository.
+        @repository = repository
+        @path = repository.path
+      end
+
+      def empty?
+        # We will override this implementation in gitaly-ruby because we cannot
+        # use '@repository' there.
+        #
+        # Caches and memoization used on the Rails side
+        !@repository.exists? || @repository.empty?
+      end
+
+      def commit_id(revision)
+        # We will override this implementation in gitaly-ruby because we cannot
+        # use '@repository' there.
+        @repository.commit(revision)&.sha
+      end
+
+      def branch_exists?(name)
+        # We will override this implementation in gitaly-ruby because we cannot
+        # use '@repository' there.
+        @repository.branch_exists?(name)
+      end
+
+      # Compares self to a Gitlab::Git::Repository. This implementation uses
+      # 'self.gitaly_repository' so that it will also work in the
+      # GitalyRemoteRepository subclass defined in gitaly-ruby.
+      def same_repository?(other_repository)
+        gitaly_repository.storage_name == other_repository.storage &&
+          gitaly_repository.relative_path == other_repository.relative_path
+      end
+
+      def fetch_env
+        gitaly_ssh = File.absolute_path(File.join(Gitlab.config.gitaly.client_path, 'gitaly-ssh'))
+        gitaly_address = gitaly_client.address(storage)
+        gitaly_token = gitaly_client.token(storage)
+
+        request = Gitaly::SSHUploadPackRequest.new(repository: gitaly_repository)
+        env = {
+          'GITALY_ADDRESS' => gitaly_address,
+          'GITALY_PAYLOAD' => request.to_json,
+          'GITALY_WD' => Dir.pwd,
+          'GIT_SSH_COMMAND' => "#{gitaly_ssh} upload-pack"
+        }
+        env['GITALY_TOKEN'] = gitaly_token if gitaly_token.present?
+
+        env
+      end
+
+      private
+
+      # Must return an object that responds to 'address' and 'storage'.
+      def gitaly_client
+        Gitlab::GitalyClient
+      end
+
+      def storage
+        gitaly_repository.storage_name
+      end
+    end
+  end
+end